2145161 has 4 divisors (see below), whose sum is σ = 2197524. Its totient is φ = 2092800.

The previous prime is 2145151. The next prime is 2145163. The reversal of 2145161 is 1615412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 309136 + 1836025 = 556^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145161 - 2⁶ = 2145097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26120 + ... + 26201.

It is an arithmetic number, because the mean of its divisors is an integer number (549381).

2^2145161 is an apocalyptic number.

It is an amenable number.

2145161 is a deficient number, since it is larger than the sum of its proper divisors (52363).

2145161 is an equidigital number, since it uses as much as digits as its factorization.

2145161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52362.

The product of its digits is 240, while the sum is 20.

The square root of 2145161 is about 1464.6368150501. The cubic root of 2145161 is about 128.9693856001.

It can be divided in two parts, 21451 and 61, that added together give a palindrome (21512).

The spelling of 2145161 in words is "two million, one hundred forty-five thousand, one hundred sixty-one".